Yadda za a hana jirgin kewaye warping

1, Me yasa ake buƙatar allon da’ira ya zama madaidaiciya

A kan layin sakawa ta atomatik, idan allon da aka buga ba lebur bane, zai haifar da rashin daidaiton matsayi, ba za a iya saka abubuwan cikin ramuka da faifan hawa na jirgin ba, har ma suna lalata injin shigar da atomatik. Allon da aka sanya tare da aka gyara yana lanƙwasa bayan walda, kuma ƙafafun ɓangarorin suna da wuyar yanke lebur da tsabta. Ba za a iya shigar da allon ba a kan chassis ko soket a cikin injin, don haka yana da matukar wahala ga masana’antar taro ta gamu da jirgi. A halin yanzu, allunan da aka buga sun shiga zamanin shigan farfajiya da girka guntu, kuma dole ne shuwagabannin tarurruka su sami ƙarin buƙatu masu tsauri don warping jirgin.

2 Daidaitacce da hanyar gwaji don yaƙi

Dangane da ipc-6012 na Amurka (bugun 1996) <<ganewa da Ƙayyadaddun Ayyuka don allon bugawa mai ƙarfi>>, mafi girman izinin warpage da murdiya don allon da aka ɗora akan allo shine 0.75%, da 1.5% don sauran allon. Wannan yana inganta buƙatun don allon allon da aka ɗora akan idan aka kwatanta da ipc-rb-276 (bugun 1992). A halin yanzu, yarda warpage na kowane masana’antar taro na lantarki, ko mai gefe biyu ko mai yawa, yana da kauri 1.6mm, yawanci 0.70 ~ 0.75%. Don yawancin allon SMT da BGA, ana buƙatar zama 0.5%. Wasu masana’antun lantarki suna ba da shawarar haɓaka ma’aunin yaƙin zuwa 0.3%. Hanyar gwajin warpage zai dace da gb4677.5-84 ko ipc-tm-650.2.4.22b. Sanya allon da aka buga akan dandamalin da aka tabbatar, shigar da allurar gwajin a cikin wurin tare da mafi girman yaƙin, kuma raba diamita na allurar gwajin ta tsawon lanƙwasa gefen allon da aka buga don ƙididdige warpage na allon da aka buga.

3, Anti warping farantin a lokacin masana’antu

1. Tsarin injiniya: kiyayewa a cikin Tsarin PCB:

A. Tsararren zanen gado da aka warke tsakanin yadudduka zai zama daidaitacce. Misali, kaurin da ke tsakanin yadudduka 1 ~ 2 da 5 ~ 6 na yadudduka shida za su yi daidai da adadin zanen gado da aka warke, in ba haka ba yana da sauƙin warp bayan lamination.

B. Za’a yi amfani da samfuran masu siyarwa iri ɗaya don katako mai ƙyalli da farantin warkarwa.

C. Yankin tsarin layi akan farfajiya na sama da saman B na saman Layer zai kasance kusa sosai. Idan farfajiya ta kasance babban farfajiya na jan ƙarfe da farfajiyar B kawai tana ɗaukar ‘yan wayoyi, allon da aka buga yana da sauƙin warp bayan etching. Idan bambancin yankin layi tsakanin ɓangarorin biyu ya yi yawa, za a iya ƙara wasu madaidaitan grids a gefe kaɗan don daidaitawa.

2. Farantin bushewa kafin a rufe:

Manufar bushewar laminate na jan ƙarfe kafin a rufe (150 ° C, lokacin 8 ± 2 hours) shine cire danshi a cikin farantin, gabaɗaya ƙarfafa resin a cikin farantin kuma ƙara kawar da damuwar da ke cikin farantin, wanda ke taimakawa don hana warpage farantin. A halin yanzu, da yawa bangarori biyu da bangarori da yawa har yanzu suna bin matakin bushewa kafin ko bayan rufewa. Koyaya, akwai keɓancewa a wasu masana’antar farantin. A halin yanzu, ƙa’idodin lokacin bushewa na masana’antun PCB suma ba sa jituwa, daga sa’o’i 4 zuwa 10. Ana ba da shawarar yanke shawara gwargwadon darajar allon da aka buga da buƙatun abokin ciniki don yaƙi. Duk hanyoyin biyu suna yiwuwa. Ana ba da shawarar bushe allon bayan yankewa. Farantin ciki kuma za a bushe.

3. Longitude and latitude of semi warke sheet:

Ƙarfin warp da weft na takardar warkarwa mai warkewa bayan lamination sun bambanta, don haka dole ne a rarrabe warp da weft yayin blanking da lamination. In ba haka ba, yana da sauƙi a haifar da warpage na ƙarar da aka gama bayan lamination, kuma yana da wahalar gyara koda an matsa matsi don bushe farantin. Dalilai da yawa na yadudduka na allon allo da yawa suna haifar da rashin sanin nisa da latitude na fakitin warkarwa a lokacin lamination.

Yadda za a rarrabe tsakanin longitude da latitude? Hanyar jujjuyawar takardar warkar da aka warkar da ita ita ce karkatacciyar hanya, kuma faɗin faɗin ita ce hanyar weft; Don murfin jan ƙarfe, gefen dogon yana cikin hanyar weft, kuma ɗan gajeren gefen yana cikin karkatacciyar hanya. Idan ba ku da tabbas, kuna iya dubawa tare da mai ƙera ko mai siyarwa.

4. Taimakon danniya bayan lamination:

Bayan matsi mai zafi da matsi mai sanyi, fitar da katako mai yawa, yanke ko niƙa burar, sannan sanya shi a cikin tanda a 150 ℃ na awanni 4, don sannu a hankali sakin damuwa a cikin jirgin kuma warkar da resin gaba ɗaya. . Ba za a iya tsallake wannan matakin ba.

5. Takardar tana buƙatar daidaitawa yayin zaɓin lantarki:

Lokacin da 0.4 ~ 0.6mm ultra-thin multilayer board ana amfani da shi don farantin saman electroplating da tsarin electroplating, za a yi rollers na musamman. Bayan ƙulla faranti na bakin ciki a kan sandar tashi a kan layin wutar lantarki ta atomatik, yi amfani da madaidaiciyar sanda don ƙulla rollers a kan duk sandar tashi, don daidaita duk faranti a kan abin nadi, don farantan faranti ba su lalace ba. Ba tare da wannan ma’aunin ba, faranti na bakin ciki zai lanƙwasa bayan zaɓin murfin jan ƙarfe na 20 ko 30 micron, kuma yana da wahalar magancewa.

6. Sanyin farantin bayan matakin iska mai zafi:

Lokacin da iska mai zafi ta daidaita allon bugawa, babban zazzabi na wanka mai siyarwa (kusan 250 ℃) yana shafar shi, sannan a sanya shi akan marmara ko farantin ƙarfe don sanyaya yanayi, kuma a aika zuwa mai sarrafa gidan waya. don tsaftacewa. Wannan yana da kyau ga anti warping na hukumar. Don haɓaka haske na saman gubar gubar, wasu masana’antun suna sanya faranti cikin ruwan sanyi nan da nan bayan matakin iska mai zafi, kuma suna fitar da su don magani bayan ‘yan daƙiƙa kaɗan. Wannan zafi ɗaya da tasirin sanyi ɗaya yana iya haifar da yaƙe -yaƙe, delamination ko blistering akan wasu nau’ikan faranti. Bugu da ƙari, ana iya shigar da gado mai iyo iska a kan kayan aikin don sanyaya.

7. Maganin warping farantin:

A cikin masana’antar da aka sarrafa da kyau, za a gudanar da duba madaidaiciya 100% yayin binciken ƙarshe na allon buga. Za a fitar da duk allon da bai cancanta ba, a saka a cikin tanda, a bushe a 150 ℃ kuma a cikin matsanancin matsin lamba na awanni 3 ~ 6, kuma a sanyaya ta halitta a ƙarƙashin matsin lamba. Sa’an nan kuma fitar da allon bayan sauƙaƙe matsin lamba kuma duba madaidaiciya. Ta wannan hanyar, ana iya adana wasu allon. Wasu allon suna buƙatar bushewa da matsi sau biyu ko sau uku don a daidaita su. Na’urar huɗu ta warping da madaidaiciyar injin da Shanghai Huabao ke wakilta Shanghai Bell ta yi amfani da ita don warkar da filin jirgin da’irar. Idan ba a aiwatar da matakan aiwatar da matakan warkarwa na sama ba, wasu allon ba su da amfani kuma za a iya goge su kawai.